模拟

统计连续一段数字技巧：while(j < s.size() && s[j] == s[i]) j ++ ;

#include <iostream>

using namespace std;

int main()
{
    string s;
    cin >> s;

    int n;
    cin >> n;
    while(n -- )
    {
        string t;
        for(int i = 0;i < s.size();)
        {
            int j = i;
            while(j < s.size() && s[j] == s[i]) j ++ ;
            int cnt = j - i;
            t += to_string(cnt) + s[i];
            i = j;
        }
        s = t;
    }

    cout << s << endl;

    return 0;
}